[1][2][3] It lives in tropical primary forest habitats rich in karst rock.

[4] Scientists named this frog calcarius for the Latin language word for "limestone."

[4] This frog has been observed between 15 and 45 meters above sea level on Cat Ba Island.

The frog has been found near pools of water in the karst rock and in small, temporary lakes that dry up for part of the year.

[3] Scientists have heard the male frogs calling in April but know little else about this species' reproductive biology.